Update 11.2 solutions

Author: somacdivad

ch11-file-input-and-output/2-working-with-paths-in-python.py

@@ -19,32 +19,31 @@
 
 
 # Exercise 2
-# Display the full paths of any PNG files in the "images" folder
+# Display the full paths of any `*.png` files in the "images" folder
 file_matches = os.path.join(path, "*.png")
 print('All PNG files in "images" folder:')
 for file_name in glob.glob(file_matches):
  print(file_name)
 
 
 # Exercise 3
-# Change all PNGs to JPGs in the "images" folder and its subfolders
-# Could use indexing to get the file extension, but try using
-# os.path.splitext()
+# Rename all `*.png` files in the "images" folder and its subfolders
+# to `*_backup.png`
 for current_folder, subfolders, file_names in os.walk(path):
  for file_name in file_names:
  file_path = os.path.join(current_folder, file_name)
- file_tuple = os.path.splitext(
- file_path
- ) # split into (path, extension)
- if file_tuple[1].lower() == ".png": # check if extension is PNG
- pass # os.rename(file_path, file_tuple[0] + ".jpg")
+ if file_path.lower().endswith(".gif"):
+ new_path = file_path[-4] + "_backup.gif"
+ os.rename(file_path, new_path)
 
 
 # Exercsie 4
 # Check that the two files have been converted to JPGs successfully
-print(os.path.exists(os.path.join(path, "png file - not a gif.jpg")))
+print(os.path.exists(os.path.join(path, "png file - not a gif_backup.gif")))
 print(
- os.path.exists(os.path.join(path, "additional files/one last image.jpg"))
+ os.path.exists(
+ os.path.join(path, "additional files/one last image_backup.gif")
+ )
 )